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Author Topic: MED9 HPFP & LPFP Control  (Read 53438 times)
bk56190
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« Reply #150 on: May 18, 2018, 04:53:15 PM »

Hey guys,

Does anyone know the characteristics of LOBA HP25 for 2.5TFSI ? (pistons size ? FP size ? )
« Last Edit: May 19, 2018, 01:07:25 AM by bk56190 » Logged
Bitshifter
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« Reply #151 on: June 02, 2018, 01:34:40 AM »

I think it´s the same size like the autotech kit (11,5mm piston diameter).
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bk56190
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« Reply #152 on: June 03, 2018, 10:08:27 PM »

Few day ago, Loba said me 12.1mm.
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bk56190
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« Reply #153 on: August 20, 2018, 12:01:45 PM »

Hello,

HPFP from LOBA received and installed on my 2.5TFSI.  Loba said me piston size is 12.1mm, so i use  these values :
first :
- RQUAHDPK : 36,6mm²
- SKHDPMX : 4,5mm
- VHDP : 368cm3
=> actual pressure rail > requeted

then :
- RQUAHDPK : 36,6mm²
- SKHDPMX : 4,5mm
- VHDP : 348cm3
=> same result, actual pressure rail > requeted

Ori values are :
- RQUAHDPK : 25mm²
- SKHDPMX : 4,5mm
- VHDP : 251cm3

Do I need to reduce SKHDPMX  ?

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bk56190
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« Reply #154 on: August 21, 2018, 12:12:41 PM »

I try SKHDPMX =5 (Loba said to me), but same behaviour  Huh
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pocoloco
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« Reply #155 on: December 02, 2018, 05:49:59 PM »

any updates in here?

i´m also actually thinking about an upgrade hpfp for an rs3, but want to buy one where measurements are clear.

i asked autotech for dimensions but got no answer, anything new to the loba hpfp?

or any other advices whitch manufacturer to use?
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birchbark506
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« Reply #156 on: December 03, 2018, 07:57:04 AM »

Vis motorsport makes a good hpfp
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pocoloco
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« Reply #157 on: December 03, 2018, 02:32:54 PM »

Vis motorsport makes a good hpfp

hm, everything out of stock in their shop, so not really an option.
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bk56190
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« Reply #158 on: December 20, 2018, 03:02:48 AM »

VIS doesn't seem to be always good quality.
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Richym
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« Reply #159 on: December 20, 2018, 09:57:10 AM »

VIS doesn't seem to be always good quality.
I’ve fitted quite a few now with no problems


Sent from my iPhone using Tapatalk Pro
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Piar
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« Reply #160 on: December 22, 2018, 09:22:07 PM »

Hello,

HPFP from LOBA received and installed on my 2.5TFSI.  Loba said me piston size is 12.1mm, so i use  these values :
first :
- RQUAHDPK : 36,6mm²
- SKHDPMX : 4,5mm
- VHDP : 368cm3
=> actual pressure rail > requeted

then :
- RQUAHDPK : 36,6mm²
- SKHDPMX : 4,5mm
- VHDP : 348cm3
=> same result, actual pressure rail > requeted



Do I need to reduce SKHDPMX  ?



Hi! have you solved problem?

I have also bought loba hpfp and see same problem
But if loba said that piston size is 12.1mm
math have to be

RQUAHDPK : (12.1/2)square=36.6025
- SKHDPMX : 4,5mm(it could be change just in case if you changed your camshaft sprocket(which drives hpfp))
- VHDP : 36.6025*pi*4,5=517,4568
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bk56190
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« Reply #161 on: December 23, 2018, 12:17:14 AM »

Now, with more boost, more fuel (ethanol), I have put a specified rail pressure of 140bar, actual is around 130.

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Bitshifter
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« Reply #162 on: January 24, 2019, 08:32:48 PM »

Is there a solution for the rail pressure problem?

Just another question: does it make sence to raise pressure >130bar (with aftermarket PRV)?

HW
engine CDLF
IE HPFP upgrade kit (9.8mm piston)
HPFP upgraded with roller kit
LPFP+controller TTRS
PRV RS4
injectors stock CDL
SW
KFPRSOLHKS = 132bar
KFPRSOLHMM = 132bar
KFPRSOLHOM = 132bar
KFPRSOLKH = 132bar
KFPRSOLOFF = 132bar
KFPRSOLSCH = 132bar
KLLFPRSG = 140bar = 0,540155
KLPRMAX = 132
VHDP = 407,3
RQUAHDPK = 24
SKHDPMX=5,4

PGBDVHDO = 140bar
KFFLAF= stock from TTRS
KFNTBKS =stock from TTRS

KRKTE=0,02880







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